JP4575698B2 - The tip of the electronic endoscope - Google Patents

Description

  The present invention relates to a distal end portion of an electronic endoscope.

In an electronic endoscope incorporating a solid-state image sensor at the tip of the insertion portion, a circuit board on which electronic components constituting a drive circuit of the solid-state image sensor are attached is arranged adjacent to the rear side of the solid-state image sensor, A plurality of signal lines drawn from the tip of the signal cable inserted and disposed in the insertion portion are connected to a plurality of connection terminals provided on the circuit board (for example, Patent Documents 1 and 2).
JP 2000-199863 A JP-A-9-64273

  In the conventional electronic endoscope as described above, a large number of connection terminals are formed in a horizontal row on each of the two surfaces of the circuit board formed in a flat plate shape, and the tip of the signal cable A plurality of signal lines led out from are individually connected and fixed to each connection terminal by soldering or the like.

  However, if the circuit board is miniaturized as the solid-state imaging device is miniaturized due to technological advancement or the like, the distance between adjacent connection terminals approaches, so the solder of the signal line to the connection terminal It has become extremely difficult to avoid leakage with the adjacent connection terminal during the attaching operation.

  Further, in order to shorten the tip of the insertion portion, for example, as shown in FIG. 4, when the circuit board 91 is arranged in a direction perpendicular to the axial direction of the insertion portion tip of the electronic endoscope, If the lines 92 are arranged side by side at two locations above and below the circuit board 91, the number of signal lines 92 drawn out from the signal cable 93 at a steep angle may increase, and the signal lines 92 may be disconnected.

  Therefore, even if the circuit board is miniaturized, when connecting the signal line drawn from the signal cable to the connection terminal of the circuit board by soldering or the like, it is easily connected so as not to leak with the adjacent connection terminal. An object of the present invention is to provide a distal end portion of an electronic endoscope that can perform work and that is excellent in preventing disconnection due to less sudden bending of signal lines.

  In order to achieve the above object, the distal end portion of the electronic endoscope of the present invention has a signal in which a solid-state imaging device and a circuit board are built in the distal end of the insertion portion, and are inserted into the insertion portion in a direction parallel to the axis. At the tip of the electronic endoscope where multiple signal wires drawn from the cable tip are connected to multiple connection terminals provided on the circuit board, a substantially square signal line connection is inserted into the circuit board. A plurality of connection terminals are equally arranged on each of the four side portions of the signal line connection portion.

  In addition, the signal line connection part may be formed in a convex shape that protrudes three-dimensionally from the circuit board toward the signal cable side, and the connection terminal may be disposed on the side surface of the protrusion part.

  According to the present invention, since the connection terminals are evenly distributed and arranged on each of the four side portions of the signal line connection portion to ensure the space between the adjacent connection terminals, the signal can be obtained even if the circuit board is downsized. When connecting the signal line drawn from the cable to the connection terminal of the circuit board by soldering etc., it can be easily connected so that it does not leak with the adjacent connection terminal, and there is little sudden bending of the signal line This also helps prevent disconnection.

  A plurality of signal lines provided on the circuit board, each including a solid-state imaging device and a circuit board at the distal end of the insertion portion, and a plurality of signal lines drawn from the distal end of the signal cable inserted and disposed in the insertion portion in a direction parallel to the axis At the distal end portion of the electronic endoscope connected to the connection terminal, a substantially square signal line connection portion is provided on the circuit board in a direction perpendicular to the axial direction of the distal end portion of the insertion portion, and a plurality of connections The terminals were evenly arranged on each of the four sides of the signal line connecting portion.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows a distal end portion of an insertion portion of an electronic endoscope. A distal end portion body 2 is connected to the distal end portion of the insertion portion 1 formed in an elongated flexible tube, and the distal end portion 2 of the distal end portion body 2 is connected. An observation window 3 and an illumination window 4 are arranged on the surface. A light guide fiber bundle 5 is arranged behind the illumination window 4.

  An objective optical system 6 is disposed in the distal end main body 2 at the back of the observation window 3, and a solid-state imaging device 7 made of, for example, a CCD (Charge Coupled Device) or the like is projected onto the subject projection position by the objective optical system 6. The light receiving surface 7a is arranged.

  In this embodiment, the optical axis of the objective optical system 6 and the axis of the tip body 2 are laid out in parallel, and the light receiving surface 7a of the solid-state image sensor 7 is in relation to the optical axis of the objective optical system 6. Are arranged in a vertical orientation.

  The imaging unit holding frame 8 that holds the objective optical system 6 and the solid-state imaging device 7 is fitted and fixed in a through-hole formed in the distal end body 2 in a direction parallel to the axis, and the imaging unit holding frame. In 8, a circuit board 10 on which electronic components constituting a drive circuit of the solid-state image sensor 7 and the like are attached is accommodated adjacent to the rear side of the solid-state image sensor 7. A lead 11 extends rearward from the solid-state imaging device 7 and is connected to the circuit board 10 side. Reference numeral 12 denotes an insulating plate disposed along the outer surface of the intermediate portion of the lead 11.

  Reference numeral 15 denotes a signal cable that is inserted through the entire length of the insertion portion 1 in the direction parallel to the axis in order to transmit an imaging signal of an endoscopic observation image captured by the solid-state imaging device 7 and forward from the distal end thereof. A plurality of signal lines 16 extending to the circuit board 10 are connected to the connection terminals 17 of the circuit board 10 by soldering or the like.

  The circuit board 10 is formed into a three-dimensional shape by using, for example, a laminated ceramic, and the signal line connecting portion 10a is formed at the rear end portion of the circuit board 10 as shown in FIG. Is formed in a convex shape protruding three-dimensionally from the circuit board 10 toward the signal cable 15 side.

The signal line connecting portion 10a of such a circuit board 10 is substantially oriented in a direction perpendicular to the axial direction of the distal end portion main body 2 as shown in FIG. 3 illustrating a sectional view taken along line III-III in FIG. It is formed in a cross-sectional shape that forms a square, and a plurality of connection terminals 17 are evenly arranged on the side surfaces of the four sides. As shown in FIGS. 1 and 2, the plurality of connection terminals 17 are provided on the side surface of the convex signal line connection portion 10 a up to the region of the protruding base portion, and the tip side portion of each signal line 16 ( The conducting wire 16 ') is bent in a state along the rear face of the circuit board 10 which is the floor of the signal line connecting portion 10a.

  The conductive wires 16 'in each signal line 16 are connected and fixed to the connection terminals 17 by soldering or the like, and are uniformly distributed on each of the four sides of the signal line connection portion 10a formed in a substantially square shape. Since the connection terminals 17 are arranged, even if the circuit board 10 is downsized, the connection work can be easily performed so as to ensure a sufficient gap between the adjacent connection terminals 17 so as not to leak with the adjacent connection terminals 17. It can be performed.

  Moreover, since it is not necessary to bend the signal line 16 led out from the signal cable 15 toward the connection terminal 17 suddenly, occurrence of disconnection of the signal line 16 is also suppressed.

It is a perspective view of the signal line connection part of the front-end | tip part of the electronic endoscope of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the electronic endoscope of the Example of this invention. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 of the distal end portion of the electronic endoscope of the embodiment of the present invention. It is a side view of the signal line connection part of the front-end | tip part of the conventional electronic endoscope.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 2 Front-end | tip part body 7 Solid-state image sensor 10 Circuit board 10a Signal line connection part 15 Signal cable 16 Signal line 16 'Conducting wire 17 Connection terminal

Claims (1)

A solid-state imaging device and a circuit board are built into the distal end of the insertion portion, and a plurality of signal lines extending forward from the distal end of the signal cable inserted and disposed in the insertion portion in a direction parallel to the axis line are formed on the circuit board. At the tip of the electronic endoscope connected from behind to the plurality of connecting terminals provided,
Signal line connecting portion of substantially square convex stereoscopically projecting rearward from the circuit board toward the signal cable side, the circuit in a direction perpendicular to the axial direction of the distal end portion of the insertion portion A plurality of connection terminals are provided on the side surface of the convex signal line connection portion up to the region of the protruding base portion, and a tip side portion of each signal line is formed on the signal line connection portion. A tip portion of an electronic endoscope, which is bent in a state along a rearward surface of the circuit board which is a floor of the electronic endoscope.

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